
<style type="text/css">
table {border: 2px solid blue; margin: 0px}
tr {border: 1px solid green; margin: 1px}
td {border: 1px solid red; padding: 1px solid red}
</style>

<!--
有上面的css定义，下面的显示就会自动套用该CSS定义
-->
<h1>Hello World</h1>
<h2>China Daily</h2>
<h3>A Big Apple</h3>
<table>
<tr>
  <td>Name</td>
  <td>Age</td>
</tr>
<tr>
  <td>Jack</td>
  <td>20</td>
</table>
